I've read many of the other posts, and I'm somewhat re-assured that I'm not the only one having problems with hot water pressure. For confirmation, here's my problem: I have a standard gas hot water heater in my basement; throughout the entire house my hot water pressure has recently dropped dramatically (no drop in cold water pressure). The problem exists in bathroom sinks, showers, kitchen sink, clothes washer, etc. I have flushed the system using the bottom drain and tonight opened the pressure release valve for about a minute as additional troubleshooting before I found this forum. Based on the other posts I've read, I'm assuming that I have a clog in one of my central pipes feeding water to or from the hot water heater, most likely at one of my valves. I'm correct, is this most likely going to be on the inlet (cold) or outlet (hot) valve on top of the water heater? Any suggestions would be appreciated.

Most likely on the hot side. Try this, shut the cold water off to the hot water heater. Open the highest, farthest hot water tap. Open the drain valve. All the hot water should run back into the tank pushing the crud back into it and out the drain. Close everything and turn the water back on to the tank.

Try this. I had the same problem. Good pressure from the cold side... feeble pressure from the hot side-throughout the house. Assuming all valves are open and city pressures are normal...
You have a blockage restricting the flow of hot water from the boiler to the taps. This is what I did today to fix my problem. I hope it works for you.
1- Close the valve that feeds water into the hot water tank.2- Turn off power to the tank (gas or electric)3- Close the main water supply valve that feeds water to your house.4- Open upstairs valves (like in the kitchen) and keep them open.5- Open downstairs valves (this will drain water from above)6- Look at your hot water tank. Two pipes- one going IN one going OUT (IN is marked COLD, OUT is marked HOT)7- You don't have a problem with cold water pressure. So let's look at the hot water side. (The out side)8- In my case I disconnected the hot (out) pipe from the boiler. Usually this will be a copper pipe with ridges that allow you to bend it back and forth. You will need a crescent or a channel lock wrench to disconnect it. 9-out of space. Contact me at [email protected]